aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S
blob: 607f282a9a2d07a1f65449e86be2c3ae7d6c7379 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
/* Save current context and jump to a new context.
   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sysdep.h>
#include <rtld-global-offsets.h>
#include <shlib-compat.h>

#define __ASSEMBLY__
#include <asm/ptrace.h>
#include "ucontext_i.h"

ENTRY(__swapcontext)
	/* Save the current context */
	stw	r3,_FRAME_PARM_SAVE1(r1)
	addi	r3,r3,_UC_REG_SPACE+12
	clrrwi  r3,r3,4
	stw	r0,_UC_GREGS+(PT_R0*4)(r3)
	stw	r1,_UC_GREGS+(PT_R1*4)(r3)
	mflr	r0
	stwu	r1,-16(r1)
	stw	r0,20(r1)
	stw	r31,12(r1)
	stw	r31,_UC_GREGS+(PT_R31*4)(r3)
	mr	r31,r4			/* new context pointer */
	stw	r0,_UC_GREGS+(PT_LNK*4)(r3)
	stw	r0,_UC_GREGS+(PT_NIP*4)(r3)
	stw	r2,_UC_GREGS+(PT_R2*4)(r3)
	stw	r4,_UC_GREGS+(PT_R4*4)(r3)
	stw	r5,_UC_GREGS+(PT_R5*4)(r3)
	stw	r6,_UC_GREGS+(PT_R6*4)(r3)
	stw	r7,_UC_GREGS+(PT_R7*4)(r3)
	stw	r8,_UC_GREGS+(PT_R8*4)(r3)
	stw	r9,_UC_GREGS+(PT_R9*4)(r3)
	stw	r10,_UC_GREGS+(PT_R10*4)(r3)
	stw	r11,_UC_GREGS+(PT_R11*4)(r3)
	stw	r12,_UC_GREGS+(PT_R12*4)(r3)
	stw	r13,_UC_GREGS+(PT_R13*4)(r3)
	stw	r14,_UC_GREGS+(PT_R14*4)(r3)
	stw	r15,_UC_GREGS+(PT_R15*4)(r3)
	stw	r16,_UC_GREGS+(PT_R16*4)(r3)
	stw	r17,_UC_GREGS+(PT_R17*4)(r3)
	stw	r18,_UC_GREGS+(PT_R18*4)(r3)
	stw	r19,_UC_GREGS+(PT_R19*4)(r3)
	stw	r20,_UC_GREGS+(PT_R20*4)(r3)
	stw	r21,_UC_GREGS+(PT_R21*4)(r3)
	stw	r22,_UC_GREGS+(PT_R22*4)(r3)
	stw	r23,_UC_GREGS+(PT_R23*4)(r3)
	stw	r24,_UC_GREGS+(PT_R24*4)(r3)
	stw	r25,_UC_GREGS+(PT_R25*4)(r3)
	stw	r26,_UC_GREGS+(PT_R26*4)(r3)
	stw	r27,_UC_GREGS+(PT_R27*4)(r3)
	stw	r28,_UC_GREGS+(PT_R28*4)(r3)
	stw	r29,_UC_GREGS+(PT_R29*4)(r3)
	stw	r30,_UC_GREGS+(PT_R30*4)(r3)
	mfctr	r0
	stw	r0,_UC_GREGS+(PT_CTR*4)(r3)
	mfxer	r0
	stw	r0,_UC_GREGS+(PT_XER*4)(r3)
	mfcr	r0
	stw	r0,_UC_GREGS+(PT_CCR*4)(r3)

	/* Set the return value of swapcontext to "success".  R3 is the only
	   register whose value is not preserved in the saved context.  */
	li	r0,0
	stw	r0,_UC_GREGS+(PT_R3*4)(r3)

	/* Zero fill fields that can't be set in user state. */
	stw	r0,_UC_GREGS+(PT_MSR*4)(r3)
	stw	r0,_UC_GREGS+(PT_MQ*4)(r3)

	/* Save the floating-point registers */
	stfd	fp0,_UC_FREGS+(0*8)(r3)
	stfd	fp1,_UC_FREGS+(1*8)(r3)
	stfd	fp2,_UC_FREGS+(2*8)(r3)
	stfd	fp3,_UC_FREGS+(3*8)(r3)
	stfd	fp4,_UC_FREGS+(4*8)(r3)
	stfd	fp5,_UC_FREGS+(5*8)(r3)
	stfd	fp6,_UC_FREGS+(6*8)(r3)
	stfd	fp7,_UC_FREGS+(7*8)(r3)
	stfd	fp8,_UC_FREGS+(8*8)(r3)
	stfd	fp9,_UC_FREGS+(9*8)(r3)
	stfd	fp10,_UC_FREGS+(10*8)(r3)
	stfd	fp11,_UC_FREGS+(11*8)(r3)
	stfd	fp12,_UC_FREGS+(12*8)(r3)
	stfd	fp13,_UC_FREGS+(13*8)(r3)
	stfd	fp14,_UC_FREGS+(14*8)(r3)
	stfd	fp15,_UC_FREGS+(15*8)(r3)
	stfd	fp16,_UC_FREGS+(16*8)(r3)
	stfd	fp17,_UC_FREGS+(17*8)(r3)
	stfd	fp18,_UC_FREGS+(18*8)(r3)
	stfd	fp19,_UC_FREGS+(19*8)(r3)
	stfd	fp20,_UC_FREGS+(20*8)(r3)
	stfd	fp21,_UC_FREGS+(21*8)(r3)
	stfd	fp22,_UC_FREGS+(22*8)(r3)
	stfd	fp23,_UC_FREGS+(23*8)(r3)
	stfd	fp24,_UC_FREGS+(24*8)(r3)
	stfd	fp25,_UC_FREGS+(25*8)(r3)
	stfd	fp26,_UC_FREGS+(26*8)(r3)
	stfd	fp27,_UC_FREGS+(27*8)(r3)
	stfd	fp28,_UC_FREGS+(28*8)(r3)
	stfd	fp29,_UC_FREGS+(29*8)(r3)
	mffs	fp0
	stfd	fp30,_UC_FREGS+(30*8)(r3)
	stfd	fp31,_UC_FREGS+(31*8)(r3)
	stfd	fp0,_UC_FREGS+(32*8)(r3)
#ifdef PIC
	mflr    r8
	bl      _GLOBAL_OFFSET_TABLE_@local-4
	mflr    r7
# ifdef SHARED
	lwz     r7,_rtld_global_ro@got(r7)
	mtlr    r8
	lwz     r7,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r7)
# else
	lwz     r7,_dl_hwcap@got(r7)
	mtlr    r8
	lwz     r7,0(r7)
# endif
#else
	lis	r7,_dl_hwcap@ha
	lwz     r7,_dl_hwcap@l(r7)
#endif
	andis.	r7,r7,(PPC_FEATURE_HAS_ALTIVEC >> 16)
	beq	L(no_vec)

	la	r10,(_UC_VREGS)(r3)
	la	r9,(_UC_VREGS+16)(r3)

	stvx  v0,0,r10
	stvx  v1,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v2,0,r10
	stvx  v3,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v4,0,r10
	stvx  v5,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v6,0,r10
	stvx  v7,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v8,0,r10
	stvx  v9,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v10,0,r10
	stvx  v11,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v12,0,r10
	stvx  v13,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v14,0,r10
	stvx  v15,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v16,0,r10
	stvx  v17,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v18,0,r10
	stvx  v11,0,r9
	addi  r19,r10,32
	addi  r9,r9,32

	stvx  v20,0,r10
	stvx  v21,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v22,0,r10
	stvx  v23,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v24,0,r10
	stvx  v25,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v26,0,r10
	stvx  v27,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v28,0,r10
	stvx  v29,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v30,0,r10
	stvx  v31,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	stvx  v10,0,r10
	stvx  v11,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	mfvscr	v0
	mfspr	r0,VRSAVE
	stvx	v0,0,r10
	sync
 	stw	r0,0(r10)

L(no_vec):
/* Restore ucontext (parm1) from stack.  */
	lwz	r12,_FRAME_PARM_SAVE1+16(r1)
	li	r4,0
	stw	r3,_UC_REGS_PTR(r12)
	addi	r5,r12,_UC_SIGMASK
	li	r3,SIG_SETMASK
	bl	JUMPTARGET(sigprocmask)
	cmpwi	r3,0
	bne	L(error_exit)

	/*
	 * If the new ucontext refers to the point where we were interrupted
	 * by a signal, we have to use the rt_sigreturn system call to
	 * return to the context so we get both LR and CTR restored.
	 *
	 * Otherwise, the context we are restoring is either just after
	 * a procedure call (getcontext/swapcontext) or at the beginning
	 * of a procedure call (makecontext), so we don't need to restore
	 * r0, xer, ctr.  We don't restore r2 since it will be used as
	 * the TLS pointer.
	 */
	mr	r4,r31
	lwz	r31,_UC_REGS_PTR(r31)
	lwz	r0,_UC_GREGS+(PT_MSR*4)(r31)
	cmpwi	r0,0
	bne	L(do_sigret)

#ifdef PIC
	mflr    r8
	bl      _GLOBAL_OFFSET_TABLE_@local-4
	mflr    r7
# ifdef SHARED
	lwz     r7,_rtld_global_ro@got(r7)
	mtlr    r8
	lwz     r7,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r7)
# else
	lwz     r7,_dl_hwcap@got(r7)
	mtlr    r8
	lwz     r7,0(r7)
# endif
#else
	lis	r7,_dl_hwcap@ha
	lwz     r7,_dl_hwcap@l(r7)
#endif
	andis.	r7,r7,(PPC_FEATURE_HAS_ALTIVEC >> 16)
	la	r10,(_UC_VREGS)(r31)
	beq	L(has_no_vec)

	lwz   r0,(32*16)(r10)
	li    r9,(32*16)
	cmpwi r0,0
	mtspr VRSAVE,r0
	beq   L(has_no_vec)

	lvx   v19,r9,r10
	la    r9,(16)(r10)

	lvx   v0,0,r10
	lvx   v1,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	mtvscr  v19
	lvx   v2,0,r10
	lvx   v3,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v4,0,r10
	lvx   v5,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v6,0,r10
	lvx   v7,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v8,0,r10
	lvx   v9,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v10,0,r10
	lvx   v11,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v12,0,r10
	lvx   v13,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v14,0,r10
	lvx   v15,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v16,0,r10
	lvx   v17,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v18,0,r10
	lvx   v11,0,r9
	addi  r19,r10,32
	addi  r9,r9,32

	lvx   v20,0,r10
	lvx   v21,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v22,0,r10
	lvx   v23,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v24,0,r10
	lvx   v25,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v26,0,r10
	lvx   v27,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v28,0,r10
	lvx   v29,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v30,0,r10
	lvx   v31,0,r9
	addi  r10,r10,32
	addi  r9,r9,32

	lvx   v10,0,r10
	lvx   v11,0,r9

L(has_no_vec):
	/* Restore the floating-point registers */
	lfd	fp31,_UC_FREGS+(32*8)(r31)
	lfd	fp0,_UC_FREGS+(0*8)(r31)
	mtfsf	0xff,fp31
	lfd	fp1,_UC_FREGS+(1*8)(r31)
	lfd	fp2,_UC_FREGS+(2*8)(r31)
	lfd	fp3,_UC_FREGS+(3*8)(r31)
	lfd	fp4,_UC_FREGS+(4*8)(r31)
	lfd	fp5,_UC_FREGS+(5*8)(r31)
	lfd	fp6,_UC_FREGS+(6*8)(r31)
	lfd	fp7,_UC_FREGS+(7*8)(r31)
	lfd	fp8,_UC_FREGS+(8*8)(r31)
	lfd	fp9,_UC_FREGS+(9*8)(r31)
	lfd	fp10,_UC_FREGS+(10*8)(r31)
	lfd	fp11,_UC_FREGS+(11*8)(r31)
	lfd	fp12,_UC_FREGS+(12*8)(r31)
	lfd	fp13,_UC_FREGS+(13*8)(r31)
	lfd	fp14,_UC_FREGS+(14*8)(r31)
	lfd	fp15,_UC_FREGS+(15*8)(r31)
	lfd	fp16,_UC_FREGS+(16*8)(r31)
	lfd	fp17,_UC_FREGS+(17*8)(r31)
	lfd	fp18,_UC_FREGS+(18*8)(r31)
	lfd	fp19,_UC_FREGS+(19*8)(r31)
	lfd	fp20,_UC_FREGS+(20*8)(r31)
	lfd	fp21,_UC_FREGS+(21*8)(r31)
	lfd	fp22,_UC_FREGS+(22*8)(r31)
	lfd	fp23,_UC_FREGS+(23*8)(r31)
	lfd	fp24,_UC_FREGS+(24*8)(r31)
	lfd	fp25,_UC_FREGS+(25*8)(r31)
	lfd	fp26,_UC_FREGS+(26*8)(r31)
	lfd	fp27,_UC_FREGS+(27*8)(r31)
	lfd	fp28,_UC_FREGS+(28*8)(r31)
	lfd	fp29,_UC_FREGS+(29*8)(r31)
	lfd	fp30,_UC_FREGS+(30*8)(r31)
	lfd	fp31,_UC_FREGS+(31*8)(r31)

	/* Restore LR and CCR, and set CTR to the NIP value */
	lwz	r3,_UC_GREGS+(PT_LNK*4)(r31)
	lwz	r4,_UC_GREGS+(PT_NIP*4)(r31)
	lwz	r5,_UC_GREGS+(PT_CCR*4)(r31)
	mtlr	r3
	mtctr	r4
	mtcr	r5

	/* Restore the general registers */
	lwz	r1,_UC_GREGS+(PT_R1*4)(r31)
	lwz	r3,_UC_GREGS+(PT_R3*4)(r31)
	lwz	r4,_UC_GREGS+(PT_R4*4)(r31)
	lwz	r5,_UC_GREGS+(PT_R5*4)(r31)
	lwz	r6,_UC_GREGS+(PT_R6*4)(r31)
	lwz	r7,_UC_GREGS+(PT_R7*4)(r31)
	lwz	r8,_UC_GREGS+(PT_R8*4)(r31)
	lwz	r9,_UC_GREGS+(PT_R9*4)(r31)
	lwz	r10,_UC_GREGS+(PT_R10*4)(r31)
	lwz	r11,_UC_GREGS+(PT_R11*4)(r31)
	lwz	r12,_UC_GREGS+(PT_R12*4)(r31)
	lwz	r13,_UC_GREGS+(PT_R13*4)(r31)
	lwz	r14,_UC_GREGS+(PT_R14*4)(r31)
	lwz	r15,_UC_GREGS+(PT_R15*4)(r31)
	lwz	r16,_UC_GREGS+(PT_R16*4)(r31)
	lwz	r17,_UC_GREGS+(PT_R17*4)(r31)
	lwz	r18,_UC_GREGS+(PT_R18*4)(r31)
	lwz	r19,_UC_GREGS+(PT_R19*4)(r31)
	lwz	r20,_UC_GREGS+(PT_R20*4)(r31)
	lwz	r21,_UC_GREGS+(PT_R21*4)(r31)
	lwz	r22,_UC_GREGS+(PT_R22*4)(r31)
	lwz	r23,_UC_GREGS+(PT_R23*4)(r31)
	lwz	r24,_UC_GREGS+(PT_R24*4)(r31)
	lwz	r25,_UC_GREGS+(PT_R25*4)(r31)
	lwz	r26,_UC_GREGS+(PT_R26*4)(r31)
	lwz	r27,_UC_GREGS+(PT_R27*4)(r31)
	lwz	r28,_UC_GREGS+(PT_R28*4)(r31)
	lwz	r29,_UC_GREGS+(PT_R29*4)(r31)
	lwz	r30,_UC_GREGS+(PT_R30*4)(r31)
	lwz	r31,_UC_GREGS+(PT_R31*4)(r31)

	bctr

L(error_exit):
	lwz	r31,12(r1)
	lwz	r0,20(r1)
	addi	r1,r1,16
	mtlr	r0
	blr

L(do_sigret):
	addi	r1,r4,-0xd0
	li	r0,SYS_ify(rt_sigreturn)
	sc
	/* NOTREACHED */

PSEUDO_END(__swapcontext)

versioned_symbol (libc, __swapcontext, swapcontext, GLIBC_2_3_4)

#if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)

ENTRY(__novec_swapcontext)
	/* Save the current context */
	addi	r3,r3,_UC_REG_SPACE
	stw	r3,_UC_REGS_PTR - _UC_REG_SPACE(r3)
	stw	r0,_UC_GREGS+(PT_R0*4)(r3)
	stw	r1,_UC_GREGS+(PT_R1*4)(r3)
	mflr	r0
	stwu	r1,-16(r1)
	stw	r0,20(r1)
	stw	r31,12(r1)
	stw	r31,_UC_GREGS+(PT_R31*4)(r3)
	mr	r31,r4			/* new context pointer */
	stw	r0,_UC_GREGS+(PT_LNK*4)(r3)
	stw	r0,_UC_GREGS+(PT_NIP*4)(r3)
	stw	r2,_UC_GREGS+(PT_R2*4)(r3)
	stw	r4,_UC_GREGS+(PT_R4*4)(r3)
	stw	r5,_UC_GREGS+(PT_R5*4)(r3)
	stw	r6,_UC_GREGS+(PT_R6*4)(r3)
	stw	r7,_UC_GREGS+(PT_R7*4)(r3)
	stw	r8,_UC_GREGS+(PT_R8*4)(r3)
	stw	r9,_UC_GREGS+(PT_R9*4)(r3)
	stw	r10,_UC_GREGS+(PT_R10*4)(r3)
	stw	r11,_UC_GREGS+(PT_R11*4)(r3)
	stw	r12,_UC_GREGS+(PT_R12*4)(r3)
	stw	r13,_UC_GREGS+(PT_R13*4)(r3)
	stw	r14,_UC_GREGS+(PT_R14*4)(r3)
	stw	r15,_UC_GREGS+(PT_R15*4)(r3)
	stw	r16,_UC_GREGS+(PT_R16*4)(r3)
	stw	r17,_UC_GREGS+(PT_R17*4)(r3)
	stw	r18,_UC_GREGS+(PT_R18*4)(r3)
	stw	r19,_UC_GREGS+(PT_R19*4)(r3)
	stw	r20,_UC_GREGS+(PT_R20*4)(r3)
	stw	r21,_UC_GREGS+(PT_R21*4)(r3)
	stw	r22,_UC_GREGS+(PT_R22*4)(r3)
	stw	r23,_UC_GREGS+(PT_R23*4)(r3)
	stw	r24,_UC_GREGS+(PT_R24*4)(r3)
	stw	r25,_UC_GREGS+(PT_R25*4)(r3)
	stw	r26,_UC_GREGS+(PT_R26*4)(r3)
	stw	r27,_UC_GREGS+(PT_R27*4)(r3)
	stw	r28,_UC_GREGS+(PT_R28*4)(r3)
	stw	r29,_UC_GREGS+(PT_R29*4)(r3)
	stw	r30,_UC_GREGS+(PT_R30*4)(r3)
	mfctr	r0
	stw	r0,_UC_GREGS+(PT_CTR*4)(r3)
	mfxer	r0
	stw	r0,_UC_GREGS+(PT_XER*4)(r3)
	mfcr	r0
	stw	r0,_UC_GREGS+(PT_CCR*4)(r3)

	/* Set the return value of swapcontext to "success".  R3 is the only
	   register whose value is not preserved in the saved context.  */
	li	r0,0
	stw	r0,_UC_GREGS+(PT_R3*4)(r3)

	/* Zero fill fields that can't be set in user state. */
	stw	r0,_UC_GREGS+(PT_MSR*4)(r3)
	stw	r0,_UC_GREGS+(PT_MQ*4)(r3)

	/* Save the floating-point registers */
	stfd	fp0,_UC_FREGS+(0*8)(r3)
	stfd	fp1,_UC_FREGS+(1*8)(r3)
	stfd	fp2,_UC_FREGS+(2*8)(r3)
	stfd	fp3,_UC_FREGS+(3*8)(r3)
	stfd	fp4,_UC_FREGS+(4*8)(r3)
	stfd	fp5,_UC_FREGS+(5*8)(r3)
	stfd	fp6,_UC_FREGS+(6*8)(r3)
	stfd	fp7,_UC_FREGS+(7*8)(r3)
	stfd	fp8,_UC_FREGS+(8*8)(r3)
	stfd	fp9,_UC_FREGS+(9*8)(r3)
	stfd	fp10,_UC_FREGS+(10*8)(r3)
	stfd	fp11,_UC_FREGS+(11*8)(r3)
	stfd	fp12,_UC_FREGS+(12*8)(r3)
	stfd	fp13,_UC_FREGS+(13*8)(r3)
	stfd	fp14,_UC_FREGS+(14*8)(r3)
	stfd	fp15,_UC_FREGS+(15*8)(r3)
	stfd	fp16,_UC_FREGS+(16*8)(r3)
	stfd	fp17,_UC_FREGS+(17*8)(r3)
	stfd	fp18,_UC_FREGS+(18*8)(r3)
	stfd	fp19,_UC_FREGS+(19*8)(r3)
	stfd	fp20,_UC_FREGS+(20*8)(r3)
	stfd	fp21,_UC_FREGS+(21*8)(r3)
	stfd	fp22,_UC_FREGS+(22*8)(r3)
	stfd	fp23,_UC_FREGS+(23*8)(r3)
	stfd	fp24,_UC_FREGS+(24*8)(r3)
	stfd	fp25,_UC_FREGS+(25*8)(r3)
	stfd	fp26,_UC_FREGS+(26*8)(r3)
	stfd	fp27,_UC_FREGS+(27*8)(r3)
	stfd	fp28,_UC_FREGS+(28*8)(r3)
	stfd	fp29,_UC_FREGS+(29*8)(r3)
	mffs	fp0
	stfd	fp30,_UC_FREGS+(30*8)(r3)
	stfd	fp31,_UC_FREGS+(31*8)(r3)
	stfd	fp0,_UC_FREGS+(32*8)(r3)

	addi	r5,r3,_UC_SIGMASK - _UC_REG_SPACE
	addi	r4,r4,_UC_SIGMASK
	li	r3,SIG_SETMASK
	bl	JUMPTARGET(sigprocmask)
	cmpwi	r3,0
	bne	L(error_exit)

	/*
	 * If the new ucontext refers to the point where we were interrupted
	 * by a signal, we have to use the rt_sigreturn system call to
	 * return to the context so we get both LR and CTR restored.
	 *
	 * Otherwise, the context we are restoring is either just after
	 * a procedure call (getcontext/swapcontext) or at the beginning
	 * of a procedure call (makecontext), so we don't need to restore
	 * r0, xer, ctr.  We don't restore r2 since it will be used as
	 * the TLS pointer.
	 */
	mr	r4,r31
	lwz	r31,_UC_REGS_PTR(r31)
	lwz	r0,_UC_GREGS+(PT_MSR*4)(r31)
	cmpwi	r0,0
	bne	L(do_sigret)

	/* Restore the floating-point registers */
	lfd	fp31,_UC_FREGS+(32*8)(r31)
	lfd	fp0,_UC_FREGS+(0*8)(r31)
	mtfsf	0xff,fp31
	lfd	fp1,_UC_FREGS+(1*8)(r31)
	lfd	fp2,_UC_FREGS+(2*8)(r31)
	lfd	fp3,_UC_FREGS+(3*8)(r31)
	lfd	fp4,_UC_FREGS+(4*8)(r31)
	lfd	fp5,_UC_FREGS+(5*8)(r31)
	lfd	fp6,_UC_FREGS+(6*8)(r31)
	lfd	fp7,_UC_FREGS+(7*8)(r31)
	lfd	fp8,_UC_FREGS+(8*8)(r31)
	lfd	fp9,_UC_FREGS+(9*8)(r31)
	lfd	fp10,_UC_FREGS+(10*8)(r31)
	lfd	fp11,_UC_FREGS+(11*8)(r31)
	lfd	fp12,_UC_FREGS+(12*8)(r31)
	lfd	fp13,_UC_FREGS+(13*8)(r31)
	lfd	fp14,_UC_FREGS+(14*8)(r31)
	lfd	fp15,_UC_FREGS+(15*8)(r31)
	lfd	fp16,_UC_FREGS+(16*8)(r31)
	lfd	fp17,_UC_FREGS+(17*8)(r31)
	lfd	fp18,_UC_FREGS+(18*8)(r31)
	lfd	fp19,_UC_FREGS+(19*8)(r31)
	lfd	fp20,_UC_FREGS+(20*8)(r31)
	lfd	fp21,_UC_FREGS+(21*8)(r31)
	lfd	fp22,_UC_FREGS+(22*8)(r31)
	lfd	fp23,_UC_FREGS+(23*8)(r31)
	lfd	fp24,_UC_FREGS+(24*8)(r31)
	lfd	fp25,_UC_FREGS+(25*8)(r31)
	lfd	fp26,_UC_FREGS+(26*8)(r31)
	lfd	fp27,_UC_FREGS+(27*8)(r31)
	lfd	fp28,_UC_FREGS+(28*8)(r31)
	lfd	fp29,_UC_FREGS+(29*8)(r31)
	lfd	fp30,_UC_FREGS+(30*8)(r31)
	lfd	fp31,_UC_FREGS+(31*8)(r31)

	/* Restore LR and CCR, and set CTR to the NIP value */
	lwz	r3,_UC_GREGS+(PT_LNK*4)(r31)
	lwz	r4,_UC_GREGS+(PT_NIP*4)(r31)
	lwz	r5,_UC_GREGS+(PT_CCR*4)(r31)
	mtlr	r3
	mtctr	r4
	mtcr	r5

	/* Restore the general registers */
	lwz	r1,_UC_GREGS+(PT_R1*4)(r31)
	lwz	r3,_UC_GREGS+(PT_R3*4)(r31)
	lwz	r4,_UC_GREGS+(PT_R4*4)(r31)
	lwz	r5,_UC_GREGS+(PT_R5*4)(r31)
	lwz	r6,_UC_GREGS+(PT_R6*4)(r31)
	lwz	r7,_UC_GREGS+(PT_R7*4)(r31)
	lwz	r8,_UC_GREGS+(PT_R8*4)(r31)
	lwz	r9,_UC_GREGS+(PT_R9*4)(r31)
	lwz	r10,_UC_GREGS+(PT_R10*4)(r31)
	lwz	r11,_UC_GREGS+(PT_R11*4)(r31)
	lwz	r12,_UC_GREGS+(PT_R12*4)(r31)
	lwz	r13,_UC_GREGS+(PT_R13*4)(r31)
	lwz	r14,_UC_GREGS+(PT_R14*4)(r31)
	lwz	r15,_UC_GREGS+(PT_R15*4)(r31)
	lwz	r16,_UC_GREGS+(PT_R16*4)(r31)
	lwz	r17,_UC_GREGS+(PT_R17*4)(r31)
	lwz	r18,_UC_GREGS+(PT_R18*4)(r31)
	lwz	r19,_UC_GREGS+(PT_R19*4)(r31)
	lwz	r20,_UC_GREGS+(PT_R20*4)(r31)
	lwz	r21,_UC_GREGS+(PT_R21*4)(r31)
	lwz	r22,_UC_GREGS+(PT_R22*4)(r31)
	lwz	r23,_UC_GREGS+(PT_R23*4)(r31)
	lwz	r24,_UC_GREGS+(PT_R24*4)(r31)
	lwz	r25,_UC_GREGS+(PT_R25*4)(r31)
	lwz	r26,_UC_GREGS+(PT_R26*4)(r31)
	lwz	r27,_UC_GREGS+(PT_R27*4)(r31)
	lwz	r28,_UC_GREGS+(PT_R28*4)(r31)
	lwz	r29,_UC_GREGS+(PT_R29*4)(r31)
	lwz	r30,_UC_GREGS+(PT_R30*4)(r31)
	lwz	r31,_UC_GREGS+(PT_R31*4)(r31)

	bctr

L(novec_error_exit):
	lwz	r31,12(r1)
	lwz	r0,20(r1)
	addi	r1,r1,16
	mtlr	r0
	blr

L(novec_do_sigret):
	addi	r1,r4,-0xd0
	li	r0,SYS_ify(rt_sigreturn)
	sc
	/* NOTREACHED */

PSEUDO_END(__novec_swapcontext)

compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3_3)

#endif

#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)

#define _ERRNO_H	1
#include <bits/errno.h>

ENTRY (__swapcontext_stub)
	li	r3,ENOSYS
	b	JUMPTARGET(__syscall_error)
	END (__swapcontext_stub)

compat_symbol (libc, __swapcontext_stub, swapcontext, GLIBC_2_1)

#endif